Noise reducing device for adding machines and the like



Dec. 13, 1938. w. w. LANDSIEDEL. 2,140,135 I NOISE REDUCING DEVICE FOR, ADDING MACHINES AND THE LIKE Filed May 20, 1936 a Sheets-Sheet 1 INVENTOR.

W.W LANDSIEDEL HIS ATTORNEY.

Dec. 33, 1938. w. w.. LANDSIEDEL Q NOISE REDUCING DEVICE FOR ADDING MACHINES AND LIKE Filed May 20, 1936 3 Sheets-Sheet 2 HIS ATTORNEY.

Dec, 13, 1938. w. w. LANDSIEDEL 2,140,135

NOISE REDUCING'DEVICE FOR ADDING MACHINES AND THE LIKE Filed May 20, 1 936 s Sheets-Shet s INVENTOR. W.W.LANDS!EDE1 H! 3 ATTORNEY.

Patented Dec. 13, 1938 UNITED STATES NOISE REDUCING DEVICE FOR ADDING MACHINES AND THE LIKE Walter W. Landsiedel,

N orwood, Ohio, assignor to Remington Rand Inc., Buffalo, N. Y., a corporation of Delaware Application May 20, 1936, Serial No. 80,701

1 Claim.

My invention relates generally to adding andlike machines and more specifically to means for reducing operating noises in these machines which noises may be due to the various actions of parts therein, since most of said parts are made of metal, and also to the vibrating of cover against base, etc,

The main object of my invention is, therefore, to generally reduce noises incident to the operation of adding machines and the like, by absorbing and insulating the internal vibrations and shock imparted to the bases and covers of said machines.

A further and more specific object of this invention lies in a special base plate construction which permits an unusual absorption of both vibration and shock.

Another object is to produce a sound-reducing casing for adding and similar machines which :0 shall be simple of construction and easy of assembly.

In the accompanying drawings and description, I shall illustrate my invention as constructed specifically for use on machines of the type shown One form of the invention is illustrated in the I 30 accompanying drawings in which:

Fig. 1 is an elevation of the right hand side of a machine casing embodying my invention. Fig. 2 is a fragmentary front elevation of the same partly in section. 35 Fig. 3 is an exploded isometric view of the base plate inverted, showing the special construction thereof and also showing the insulating and damping materials used therein.

Fig. 4 is a bottom plan view of all the base pads placed in the position they assume in the machine base. i

, Like characters of reference refer to like parts in all views.

Referring to the'drawings in detail, I repre- 45 sents the base plate (Fig. 3), which was made solid except for the motor yentilating hole 2, previous to my present invention. The under side of base I is constructed with strengthening ribs indicated at 3, 4, 5, 6, and I, respectively, as shown in the drawings. This'construction forms pockets 8, 9, III, II; and I2, which heretofore had 7 solid tops integral with and as part of base I.

An important part of my invention lies in cut-- ting openings I3, I4, I5, I6, and II, respectively, 55 in the tops of these pockets, each similar in shape to its respective pocket but smaller than the tops of these pockets,s0 that damping strips "a, Ila, I5a, Ito; and Na, which may be made of felt or any other suitable material, may fit snugly into their respective pockets and receive and absorb or damp much of the noise usually forthcoming at these points. It will be noted that the openings I3, I4, I5, I6, and I1, permit a large quan v tity of the vibrations to pass directly to the damping strips without impinging upon the base. Strips I3a, etc. are backed with pieces I8 of any suitable fibrous insulating material which greatly absorb the shock and vibrations caused by the operating mechanism in action.

A retaining plate I9, made to conform to the external contours of base plate I, maintains the above mentioned felts and fiber pieces in constant and intimate-contact with each other and with their respective pockets and at the same time allows the machine to be lifted in the regularmanner by means of formed portions-2| and 22 having similar shapes to'hand-pole openings 23 and 24. v

, Considering now the machine cover, designated herein as 26 (Fig. 3), this cover previously caused a large proportion of noise in the machine because of vibrations transmitted directly to it from the edges of the base plate I, and also by sound waves, set up by the moving machine parts, striking it at various points. These vibrations of the cover 26 were further amplified upon consecutive repeat operations of any parts.

Machine cover noises and vibrations are almost entirely eliminated in my invention by use of an insulating strip 25 which very effectively absorbs them. The insulating strip 25 is adhesively secured to cover 26 on the inside and extends beneath the bottom edge thereof, thus forming a cushioning and damping element between cover and base.

Screws fasten the retaining plate I9 and base platev I together and screws 28 fasten base plate I and machine cover 26 together, these parts being insulated each from the other by the insulating pieces and strips mentioned above, thus giving a solid construction and at the same time reduc ng noise throughout the machine to a minimum.

While I have described what I consider to be a highly desirable embodiment of my invention, it is obvious that many changes in form could be made without departing from the spirit of my invention, and I, therefore, do not limit myself to the exact form herein shown and described, nor to -anything less than the whole of my invention as hereinbefore set forth, and as hereinafter ribs and openings adjacent to said ribs, vibration claimed. insulating and absorbing elements in said base What I claim as new, and desire to secure by member and covering said openings, vand a se- Letters Patent, is: curing member for holding said elements in place.

5 A casing for adding and like machines includ- 6 ing a. cover member, a. base member formed with warm w. mnnsmnm 

